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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9b57ce388d0592b637505e5ac2f4b026dacd8d9998b93842744afc4f4d5573' 
  AND token = 'NcplcTjxmHGvR8h+Dc1p/3lZAz1bfegW1j/Ucf51F5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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