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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c2ba98b0e38cc56a8040cbde83e926d5af68d08e0ab281c5d8dd33170436e9b' 
  AND token = 'cIK+q4564zrP90EU5KcwTTjW2w/C2wN3ppwpCqbAYYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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