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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8dafb73041750196f5edfa10ae944b70ffafaf4f4dec41165b8735b1b493e0' 
  AND token = 'qugip7T/9vp/nVjb8+OsTRBfWOYKrIO4PYsFQd+KRtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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