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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e70500f0894623bbd062546110d845f07e72ba4a9499b99f2ba1109b5af2448' 
  AND token = '7VQeYG/hM9c4EYeJuSo5rtufnBNaQdtqIM4IeAhhXTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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