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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '596e941e0c152ecc39445c857737a0e1cdf483f8c706ba53735bf828ca1ab86c' 
  AND token = 'qA9+XFxZmBsz4aHSU60RQE5FAXxBGp51pHxgKyadEu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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