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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a48010c81d7e93e269ed160e86f935ccc00f6b19040950cc2027867d51084a2' 
  AND token = 'LI8X+PK/KU2VCkDnygyjNiFMGJOPA1eE7zY7qIkYY8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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