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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e3312adc0aa50880e878d4a0f4dc389bef51d7b3c6857cf33cb7259cba7ab3' 
  AND token = '4+xDfFz37hLWWJ6HkFs101Me3qsWNDHm3JSp+SlGL2k=' 
  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"
    }
  }
}