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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ce1e524f9ee0987d239c6e7b8b9ccaae225106874c44622cedc1a8aae82048' 
  AND token = 'x5fuOUUw5lm4dKSL+/090RG8IFPC47T6D3WeTQb+xe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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