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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494f2e974c1345a6f04c52fd995a0071ed72c39a493c0b36de73479d1f1c73b6' 
  AND token = 'UQbJL+1ItnR5KLR2miTATtMPYSGjEkRIPKazhSg3prM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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