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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c92f5a3627147daf273e34e93024080eaa3dcfd8e495b0e7c81030f5f39eab' 
  AND token = 'YcYbiIc2rQ7reV0XCR9jmUObh/zAM4iKC2foMjIB5KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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