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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcb890f0a62151178ae9b422f42f3d4c1e015923ca2bb17a9147bb3b088eed1' 
  AND token = 'VEwVloLf1dPQvdpHWAZ6+NPqIPGLH1XpBImyCJ2TxG0=' 
  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"
    }
  }
}