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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7318f655c99a848f904e8c4a99cba90521a2069622d171fef14bba33f79c8b6d' 
  AND token = 'TTl9nK3if8w9aWHFwckY/L0oA5vjEcenm67L3i3VhC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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