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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07eb4f2bc58767d3b3b22a23e8513d33fd4632b6f6c580c7740f4871d6a1cef3' 
  AND token = 'RB1I+Gr45wbDNeP5W7PlbLx+jJ2/GopT1tkZKNnmhvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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