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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '122837c72918dfcab97a0199c0fcc45c69fd43e49b1db89aca5e6a428ac866ed' 
  AND token = 'NkJnO1j07toHn6YDtCm3p8qfuHt4sB5t4Vd/U7HkJ2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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