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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0599cc46f9ea7a320ce195d48bf93bde140048c4f2a589245514d9a80451c91' 
  AND token = '9TZcJQgtA9IU8y5Mnz9NjS7VdtgvUH6Mj0aMH27twH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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