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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02ce0845b7c9461aac0b33b08810a1212cd94864032d54ddfded8fd73f72556' 
  AND token = 'LZ0csOYyYo2fssFQUb7FCLgoqw7RWIKRS27OPcbM+5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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