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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b891509093d85b7321c2e92a12cb2bc1302ca2b7230179f8437f07f0eed5a63' 
  AND token = 'Lg2qKLuoi0oiDGyGKXcRJ296ihYXzvLpVRD2sO0x/DY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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