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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45f573b0fa4b4fbe8f68b3e6928be11932930ca0b912837b1d129dd0dadbfe4f' 
  AND token = 'eGpIrT583uRyrem5KjyRnicZ0HIePQ2QrBu07uMmbx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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