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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea45f02db84f446056529e3fca045511e128673e3ffeb097a2dec4ee98b04db' 
  AND token = 'yUBwmuO5zFKHjkGc2pHo2Jr8SYY6A54F/jURCp2Q9ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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