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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3925c97f83a2d13c32dde2c09729b6756140dba2f53df9f6478979b6902d1cfe' 
  AND token = 'XNN/5PM31b45+fh+cCikzjqN9CLnTkaFDrBOUYxD4Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}