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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bad60bc48187fbecb4dfa604b934f9cc6b349ba96c2fda5c617f38a9b2b1d74' 
  AND token = 'AVBOpAXx4BlF6ye/Eu2mE/Vteos7/wkmO3fc75AXmqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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