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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26deee0ce78bcf31e361f58cc6802a6ae3d3be71c63ae821b66bbb3047b18265' 
  AND token = '50LavHeKjAa2LLmrKCWiI3YdsHVbIa/htugHb5892Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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