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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0eca27b0ad318365573c6ffa1943e004282eee6605629c82085e151a778c1e' 
  AND token = 'NQtG2q4FUnvIGsg4GublCSq6t9INpHXnqGhLbU2BEtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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