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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3370479c0fa2bd6b8d0563f2b7eec5aece65fa1a5bf9baebcdf5f84045100c19' 
  AND token = 'jGdAcH471g17YCnlFwwP7EZM2Z8hprVUr0m2gRTZBsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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