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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea4bbc96fb54e526ede863c2551396a1d6310ac500787bf2495a446c13522ad9' 
  AND token = 'O9WwHrO5YZvKz9hUnSUyIfHmjTMuaH5fNluHmEYvSmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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