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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92462bec42537cf9d73e9db91f04913294b984b8f0e1caedd05e5100db0e8fee' 
  AND token = 'fyOBU2jGrbYhUcd9cclc0CXn7Hh/b2gnov6NwnQh6Lo=' 
  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"
    }
  }
}