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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '157e2f474fc7fc3ea5774728783addcac5680fae6d0166c4390c6bf29dfe85bf' 
  AND token = 'WgvS+KydJ27TLPt8IpE8XEgA+zXw3HIRBTNeBuK/B44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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