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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edacd57eeaf1b5aa2863aa0b232a09c9a03b0c51eb9b2144d1dcf6856bdf5b85' 
  AND token = 't/Rvv15izhMeEaUedDEmBX6BNio5TKNshez1H4D32EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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