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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50e722fd216db5819093d21fd7793b11063cbf9a1803f2ca04496dc2a740e06c' 
  AND token = 'qA6GxaUb5LZAcbSGqRClVDE+It1eJRcNFpe2iNd9Gps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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