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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508f2bba567584b442542cc076f13ed2ea64acbb77bcfd473ad3bd1ff93522ef' 
  AND token = 'kDFW9HNsT1Ak2znLwqLJS5RHRjbX6r7DXZ+T053kpvc=' 
  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"
    }
  }
}