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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd431f41493fb2b00ddea1c3087d0359685a3c8d3bfd58811f5e92734dee760' 
  AND token = 'LT6rSvBA53OvxrnYIuh56IlU4enFepi7qCQqcw79zNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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