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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '246fb8ab02b74429c26188cdb99eff6283662809992ba9551fdecec74e41d372' 
  AND token = 'js+D6q4px9NNEfkzz/RpleVB8GpxibiM5jwa9OG57oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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