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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '627c5293a9159b20afb8d10e3cef566be6bff243cb2a1beea650bf9b34cb613e' 
  AND token = 'ZfH+nlmVxfaP5dhmiDuG4eXX3mLVHGCCOxGNC/vUrVQ=' 
  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"
    }
  }
}