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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5fd6c2e45ad2c2f2340c6b2f65ddd1cb2151630037a1b32c7785fe7826616f3' 
  AND token = '6TYn/i0pe+ndDcLJW/3pNB6palhngs0DPxnnJRpaBHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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