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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccf9e6198709ea78eedbfe6abe3ec6b3ee31c01feb119993d63f4aa6c715a137' 
  AND token = '4MVAwWOorausXDoGzYlVZYmIwq9c1XRtCNa1Tb/Aw5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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