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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda4f9a764d347e77cb92ab7789217e8fa4ef4081d5a46c5d4614e6d94ca5e6f' 
  AND token = 'RTc7H3xp5DgXG6PHqbIdY6AvkJ0J+rreTXWxlnmvz8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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