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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae76d4caba0806da4d120f5b2eeede7175f5cd5c4884e1a6594aacfc0f480869' 
  AND token = 'rjmz+Wkxsc4e8ZtPfxyE5iKUkmnPt8rwgDAxCOMN6YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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