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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc695aeb9871bd7f8aad5f7545c0cc054afe4eb4f7063e1222fbee53f05f0f9' 
  AND token = 'B8TeYW1NyEDV7bBfoW6TCX+oE3I+xHzFNkN06edZkxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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