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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da36ba303aebb03a99a54beeeaf3df01827d1f964f25fa7c220c16f746f8cec7' 
  AND token = 'kHJB8Cu0N4DQYftY+wPLIMidHu1e+22qiD5bKt52AHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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