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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf70316b1e51b438aa685b94adaea3a31e904393d1c311c25fc45f016cf0523e' 
  AND token = '6s+7/6WaCGioCBz9wu7n1h2mawjWcKL5awmj51dWZs0=' 
  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"
    }
  }
}