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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213a23a72c82a5f1e8ab4f1a1605ffdf214554891de2909ad8e3fa4701369e70' 
  AND token = 'OJiw/TqvxexuHCRN5a5xReMdvRRhjWDw/KXTVfIVNFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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