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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c28276524c024fbd7a5f5c2e1262ad53f7aceecedb0758c32e3112a77f1cd893' 
  AND token = 'brXy9S05WQzv6BSNPRLxKskIqwpEYAOlddT/gyMUslA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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