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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3762ba1caba20c5715df7ddfae3373fe367e5684074f57f9682efe450ddd2ae6' 
  AND token = 'qmZF9S1p1xtWEMRpv9e9c/uL8bnc7mm5NdXt4TQsFp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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