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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ded2395409e30cdde823f623d31acd332cb17fcf85bbfcfe2d26e6fe6af600' 
  AND token = 'EylPDq1pRDe2R6whs5X4hUScTlBCc7RVRLHhRNuHjKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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